Using cracked software is a violation of intellectual property laws (copyright infringement) and Screaming Frog's End User License Agreement (EULA). The Legal Alternative: Screaming Frog Free vs. Pro

This refers to the official Screaming Frog software that has been modified by third parties to bypass the license activation mechanism. This allows users to access the paid "Pro" features (such as crawling more than 500 URLs, accessing advanced configurations, and using custom search) without paying the license fee.